FitFlop B12 Mens Surfer Slide Sandals Rubber Featuring our ergonomic, ultra-cushioned EVA Microwobbleboard midsole for instant and all-day comfort: patent-pending, triple-density design shown to reduce underfoot pressure and absorb shock developed by leading British biomechanists Dr Dave Cook and Dr Darren James at London South Bank University On our original Microwobbleboard for a generous fit